# CVE-2021-28117: kde-config-updates: libdiscover/backends/KNSBackend/KNSResource.cpp in KDE Discover before5.21.3 automatically creates links to potential...

CVE-2021-28117 is fixed in 7 products on 1 platform, first by kde-config-updates 5.21.3-0ubuntu1, released January 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-28117
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0156
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no

## Description

libdiscover/backends/KNSBackend/KNSResource.cpp in KDE Discover before5.21.3 automatically creates links to potentially dangerous URLs (that areneither https:// nor http://) based on the content of the store.kde.org website. (5.18.7 is also a fixed version.)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kde-config-updates Ubuntu 24.10 (oracular) | 5.21.3-0ubuntu1 | [kde-config-updates 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-kde-config-updates-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | kde-config-updates Ubuntu 25.04 (plucky) | 5.21.3-0ubuntu1 | [kde-config-updates 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-kde-config-updates-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover Ubuntu 24.10 (oracular) | 5.21.3-0ubuntu1 | [plasma-discover 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-plasma-discover-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover Ubuntu 25.04 (plucky) | 5.21.3-0ubuntu1 | [plasma-discover 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-plasma-discover-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-backend-flatpak Ubuntu 24.10 (oracular) | 5.21.3-0ubuntu1 | [plasma-discover-backend-flatpak 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-plasma-discover-backend-flatpak-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-backend-flatpak Ubuntu 25.04 (plucky) | 5.21.3-0ubuntu1 | [plasma-discover-backend-flatpak 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-plasma-discover-backend-flatpak-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-backend-fwupd Ubuntu 24.10 (oracular) | 5.21.3-0ubuntu1 | [plasma-discover-backend-fwupd 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-plasma-discover-backend-fwupd-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-backend-fwupd Ubuntu 25.04 (plucky) | 5.21.3-0ubuntu1 | [plasma-discover-backend-fwupd 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-plasma-discover-backend-fwupd-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-backend-snap Ubuntu 24.10 (oracular) | 5.21.3-0ubuntu1 | [plasma-discover-backend-snap 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-plasma-discover-backend-snap-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-backend-snap Ubuntu 25.04 (plucky) | 5.21.3-0ubuntu1 | [plasma-discover-backend-snap 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-plasma-discover-backend-snap-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-common Ubuntu 24.10 (oracular) | 5.21.3-0ubuntu1 | [plasma-discover-common 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-plasma-discover-common-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-common Ubuntu 25.04 (plucky) | 5.21.3-0ubuntu1 | [plasma-discover-common 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-plasma-discover-common-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-notifier Ubuntu 24.10 (oracular) | 5.21.3-0ubuntu1 | [plasma-discover-notifier 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-plasma-discover-notifier-5.21.3-0ubuntu1.md) | Jan 16, 2026 |
| Linux | plasma-discover-notifier Ubuntu 25.04 (plucky) | 5.21.3-0ubuntu1 | [plasma-discover-notifier 5.21.3-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-plasma-discover-notifier-5.21.3-0ubuntu1.md) | Jan 16, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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